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Fan controlled by temperature circuit

Temperature Controlled DC Fan

D Mohankumar - 01/17/10

This circuit can cool your heat generating electronic devices by operating a DC fan when the temperature in [...]
solar charger circuit schematic

Solar Charger for 6V Battery

D Mohankumar - 01/16/10

Here is a solar charger circuit that is used to charge Lead Acid or Ni-Cd batteries using the [...]
water level indicator circuit

Water Level Indicator Circuit

P. Marian - 01/10/10

This simple water level indicator will activate an active buzzer (e.g. BeStar BPT-23CX ) in order to make [...]
cs209A metal detector circuit

Metal Detector DIY Circuit

P. Marian - 10/26/09

The heart of this diy metal detector circuit is the CS209A IC. The metal detector is built with [...]
DIY 12V to 220V DC to AC converter built with CMOS 4047

12V to 220V DC to AC Converter Circuit

P. Marian - 10/22/09

This DIY 12V to 220V [su_tooltip content="direct current" size="6" style="bootstrap"][su_button] DC [/su_button][/su_tooltip] to [su_tooltip style="green" position="north" content="alternating current" [...]

Cell Phone Detector aka Mobile Bug

P. Marian - 01/25/09

This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence [...]

Ultrasonic Dog Repeller Circuit

P. Marian - 04/14/08

This ultrasonic dog repeller circuit will chase away angry dogs. It is build with the all known 555 [...]
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